| http://www.rbgkew.org.uk/ The Royal Botanic Gardens, Kew
http://www.rhs.org.uk/ The Royal Horticultural Society
http://www.harlandhandgarden.com/ The Harland Hand Garden (California)
http://www.hr.duke.edu/dukegardens/ The Sarah P. Duke Gardens
http://www.holdenarb.org/ The Holden Arboretum
www.cthort.org/ The Conn Horticultural Society
www.northerngardener.org/ Minnesota State Horticultural Society
www.mihortsociety.org/ Michigan State Horticultural Society
American Hosta Society
N. American Rock Garden Society
http://www.tropicalgardening.com/
National Gardening Association
I Can Garden (Canada)
American Association of Botanical Gardens and Arboreta Umbrella organization with listings for all member organizations.
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